JPH04264195A - Production of coke - Google Patents

Abstract

PURPOSE:To produce a coke exclusively used for a sintered ore. CONSTITUTION:The title process is characterized by using coal blend which contains 9% or more and 14% or less ash component and 33% or more and 37% or less volatile component and operating it in such a manner that the strength of coke (DI<30>15) at the exit of a dry quenching apparatus for coke is 80 or more and 90 or less and the particle size of the coke is 35mm or more and 48mm or less. The coal used as a raw material may be one which is inexpensive and the yield of gas and tar are good.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing coke for use in sintered ore.

0002

BACKGROUND OF THE INVENTION When producing sintered ore, coke is used as a fuel. Conventionally, the following types of coke have been used as coke for producing sintered ore. (1) Coke powder generated during blast furnace coke production (2)
) Coke made by crushing coke for blast furnaces (3) Fine coke generated in coke dry extinguishing equipment

0003

[Problems to be Solved by the Invention] However, the coke used as conventional coke for producing sintered ore has the following problems. (1) The amount of coke that can be supplied depends on the production amount of blast furnace coke. (2) The price of coal, which is a raw material, is high. (3) The yield of sintered ore is low. (4) Since the ash content is low, it is necessary to mix silica stone to maintain strength during the production of sintered ore. (5) Crushing coke is expensive. (6) Dust is generated during coke transportation.

An object of the present invention is to provide a method for producing coke which solves the above-mentioned problems of the conventional coke for producing sintered ore and which increases the amount of gas and tar produced as by-products.

[0005]

[Means for Solving the Problems] The coke manufacturing method according to the present invention has an ash content of 9% to 14% and a volatile content of 33%.
% or more and 37% or less blended coal is used, and the coke strength (DI3015) at the outlet of the coke dry extinguishing system is 80 or more and 9
0 or less, and the coke particle size is 35 mm or more and 48 mm or less.

[0006]

[Operation] The coke manufacturing method according to the present invention has an ash content of 9
% or more and 14% or less, volatile content is 33% or more and 37% or less, and the coke strength (DI3015) at the outlet of the coke dry extinguishing system is 80 or more and 90 or less, and the coke particle size is 35 mm or more and 48 mm or less. The company will operate in The reason is as follows.

(1) The ash content of the blended coal is set to 9% or more because coke strength is low if it is less than this, and the reason why the ash content is set to 14% or less is that if it exceeds this, the raw material cost increases and the silica stone reduction effect is reduced. This is because they cancel each other out.

(2) The reason why the volatile content of the blended coal is set to 33% or more is because coke strength is low if it is less than this, and the reason why it is set to 37% or less is because if it exceeds this, the amount of gas and tar generated decreases. Because it does.

(3) The reason why the coke strength is set at 80 or more is because if it is less than this, the crushing cost increases and the raw material cost increases.The reason why the coke strength is set at 90 is because
This is because if it exceeds this, it becomes difficult to take it out of the kiln.

(4) The reason why the coke particle size is set at 35 mm or more is because if it is smaller than this, the crushing cost increases and the raw material cost increases, and the reason why the coke particle size is set at 48 mm or less is that if it exceeds this, it will This is because it becomes difficult to extinguish the fire.

[0011]

[Example] Sintered ore yield when sintered ore is manufactured using coke manufactured by the coke manufacturing method of one example of the present invention, coking coal cost, crushing cost and strength of the manufactured coke, Table 1 shows the yields of gas and tar generated when coke is produced in comparison with those produced by conventional methods. Incidentally, the sintered ore yield, coking coal cost, and pulverization cost were expressed exponentially with this production method as 1.

0012

[Table 1]

[0013] As is clear from Table 1, although the coke strength is slightly lower and the crushing cost is slightly higher than coke breeze, in other respects the operating results are better than in the conventional method.

[0014]

[Effects of the invention] With this invention, the amount of coke that can be supplied is not affected by the production volume of coke for blast furnaces, the price of raw material coal is lower, the yield of sintered ore is higher, and the ash content is high, so sintering There is no need to add silica stone to maintain strength during ore production, the cost of crushing coke is lower than coke for blast furnaces, and there are advantages in that no dust is generated during coke transportation.

Claims (1)

[Claims] Claim 1: Using a blended coal with an ash content of 9% or more and 14% or less and a volatile content of 33% or more and 37% or less, the coke strength (DI3015) at the outlet of the coke dry extinguishing system is 80 or more and 90 or less, and the coke particle size is is 35mm or more 48m
1. A method for producing coke, characterized in that coke for sintered ore is produced by operating the coke so that the coke becomes less than m.